Gas cooking device and method for controlling flame size

ABSTRACT

A gas cooking device comprises a burner, a gas feed tube, a control valve used to control a gas flow, an electromagnetic generating device capable of generating an electromagnetic signal, and a control unit capable of controlling an opening size of the control valve according to the electromagnetic signal. The control valve and the electromagnetic generating device are electrically connected to the control unit respectively. By employing the control valve, the control unit, and the electromagnetic generating device, control of a flame size of the gas cooking device can be realized.

TECHNICAL FIELD

The present invention relates to the technical field of kitchen utensil, and more particularly, to a gas cooking device, and meanwhile, relates to a method for controlling a flame size of a gas cooking device.

BACKGROUND

For the existing gas cooking device, such as a gas stove, as long as gas is continuously supplied, a temperature of a cookware heated by the gas cooking device can continue to rise, and it is difficult to control the heated temperature within a certain reasonable range, and a flame size can only be modulated by manually adjusting a valve size of the gas stove. However, such adjustment method has a certain hysteresis, i.e., when a user realizes that the flame size is too large, the food has been superheated and cooked to a certain extent, resulting in loss of food nutrition and even coking. Moreover, during the whole cooking process, the user needs to constantly adjust the valve size of the gas valve according to the needs of cooking stages, thus causing frequent operations and many inconveniences in use.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to overcome the defects in the prior art and to provide a gas cooking device capable of controlling the temperature conveniently.

In order to solve the technical problem above, the technical solutions employed in the present invention are as follows.

A gas cooking device comprises a burner, a gas feed tube and a control valve used to control a gas flow, wherein the gas cooking device is further provided with an electromagnetic generating device capable of generating an electromagnetic signal and a control unit capable of controlling a valve size of the control valve, and the control valve and the electromagnetic generating device are connected to the control unit respectively. In the technical solution, the control unit is electrically connected to an electric heating device and the electromagnetic generating device preferably, but wireless signal connection and other methods can also be used in signal transmission. In addition, the connection in the technical solution can either be a direct connection or an indirect connection, i.e., the control unit can be connected to the heating device or the electromagnetic generating device through some electrical elements.

The present invention creatively sets the electromagnetic generating device on the gas cooking device to enable the gas cooking device to have a function of transmitting the electromagnetic signal, and then realize control of the temperature by cooperating with the control valve and a device capable of inducing the electromagnetic signal under control of the control unit.

A temperature control layer capable of inducing the electromagnetic signal generated by the electromagnetic generating device is arranged above or on a side of the electromagnetic generating device. The temperature control layer and the electromagnetic generating device cooperate with each other to jointly control the temperature, the temperature control layer not only can be fixedly connected to the gas cooking device to become a part of the gas cooking device, but also can be independently processed and detachably assembled on the gas cooking device to become a relatively independent component, the temperature control layer can be placed above the electromagnetic generating device at any time during use, and the temperature control layer can be taken away at any time after use. The temperature control layer can even be attached to a cooking utensil that can be used together with the gas cooking device, but no matter what combination mode is used, as long as the temperature control layer can induce the electromagnetic signal generated by the electromagnetic generating device, basic conditions for controlling the temperature are met.

As a preferred embodiment, a temperature control layer capable of inducing an electromagnetic field is arranged above a furnace frame, and the temperature control layer has a ferromagnetism or a ferrimagnetism. A temperature of the temperature control layer is adjusted through a joint action of the temperature control layer, the electromagnetic generating device, the control unit and the control valve.

Preferably, the temperature control layer has a magnetic permeability of 2,000 to 200,000 H/m and a resistivity of 30 to 130μΩ·cm.

Preferably, in order to control the gas flow conveniently, the present invention improves the gas feed tube and the control valve. For example, two to six gas feed tubes are preferably provided, and each of the gas feed tubes is provide with a control valve, and a total gas flow is controlled by controlling different flows of the gas feed tubes or closing a part of the gas feed tubes; or the gas feed tube is composed of two to six sub-tubes, and each of the sub-tubes is provided with a control valve, and the total gas flow can also be controlled by controlling a flow of each of the sub-tubes.

Preferably, the control unit comprises a detection analysis module and a control module.

The detection analysis module is connected to the electromagnetic generating device and used to detect a change of an electric parameter of the electromagnetic generating device, compare a detection value with an initial set value, and feed back an analysis result to the control module, and the electric parameter described herein is preferably a parameter of a pulse signal, a voltage, a current or a resistance, wherein the pulse signal is a pulse number, a pulse width or a pulse amplitude, etc.

An input end of the control module is connected to the detection analysis module, an output end of the control module is connected to the control valve, and the control module adjusts the gas flow through the control valve according to the analysis result to keep a temperature of the temperature control layer within a preset interval. Specifically, the detection value is compared with an initially set lowest value and an initially set highest value; when the detection value exceeds the lowest value or the highest value, the control module of the control unit will decrease or increase the detection value of the electric parameter by adjusting a size of the control valve until the detection value of the electric parameter is between the set highest value and the set lowest value; and when the detection value of the electric parameter of the electromagnetic generating device is between the set highest value and the set lowest value, the control valve can maintain an original gas feed volume. Detection analysis and control are the two basic functions of the control unit, and on this basis, other functional modules, such as data conversion module, can be added. The control unit controls the temperature by detecting a change of the electric parameter of the electromagnetic generating device, and compared with a traditional temperature sensor, the present invention can reflect the temperature of the temperature control layer in time and avoid a hysteresis of temperature detection brought by the temperature sensor.

Preferably, a cooking utensil is arranged above the burner, and a temperature control layer capable of inducing the electromagnetic signal generated by the electromagnetic generating device is arranged on the cooking utensil. As mentioned above, the temperature control layer is not necessarily attached to the gas cooking device, but can be installed on the cooking utensil, such as a cookware, when the cooking utensil is used together with the gas cooking device, the temperature control layer can also be interacted with the electromagnetic generating device, and the preferred solution changes an installation method of the temperature control layer, so that application of the temperature control layer is more flexible.

Preferably, the temperature control layer forms at least a part of the cooking utensil, that is, the temperature control layer can form a bottom of the cookware separately or can be compounded at the bottom of the cookware to become a part of the bottom of the cookware. Certainly, for three-dimensional heating, the temperature control layer can also be arranged on a cookware body.

Preferably, the temperature control layer is sheet, such as a metal sheet, or, the temperature control layer is made of a powdery or granular permalloy material or precision alloy material, and is attached to the bottom of the cookware. The so-called permalloy material is also called an iron-nickel alloy material.

As another preferred embodiment, a support plate is arranged above the burner. For the existing gas cooking device, the furnace frame is only arranged on the burner, and then the cooking utensil is placed on the furnace frame. In the preferred solution, the support plate is additionally arranged above the burner, the support plate can be arranged on the furnace frame, the cooking utensil is arranged on the support plate during cooking, and the support plate not only can stably support the cooking utensil, but also can enable the cooking utensil to be heated uniformly.

Preferably, the temperature control layer forms at least a part of the support plate, that is, the temperature control layer can form the support plate separately or can be compounded on the support plate to form a part of the support plate.

Preferably, the temperature control layer is made of a permalloy or precision alloy material.

Preferably, a Curie point temperature of the permalloy or precision alloy material is between 30° C. and 500° C. The Curie point temperature of the permalloy or precision alloy material is preferably between 70° C. and 400° C., and is further preferably between 180° C. and 350° C. When the temperature of the temperature control layer reaches a Curie point of the temperature control layer, a magnetic permeability of the temperature control layer will be suddenly decreased to close to zero, and the temperature thereof will stop rising.

Further, the precision alloy material is a material with a Curie point temperature between 180° C. and 230° C., such as a precision alloy 4J36 (produced by Shanghai Kaiye Metal Products Co., Ltd.) or a precision alloy 4J32 (produced by Shanghai Kaiye Metal Products Co., Ltd.). The precision alloy 4J36 is a special low-expansion iron-nickel alloy with an ultra-low expansion coefficient, with a Curie point temperature of 230° C. The precision alloy 4J32 is also called a Super-Invar alloy, with a Curie point temperature of 220° C.

Through research and verification, the precision alloy materials that can be applied to the present invention are preferably the following alloy materials listed in standard numbers GB/T15018-94, YB/T5239-2005, YB/T5262-93 and YB/T5254-2011, wherein the standard number GB/T15018-94 refers to the National Standard Precision Alloy Designation of the People's Republic of China, and the standard number YB/T5254-2011 refers to the Black Metallurgy Industry Standard of the People's Republic of China.

Alloy type Alloy designation Curie point Ferromanganese alloy 4J59 70 Constant elastic alloy 3J53 110 Constant elastic alloy 3J53Y 110 Elastic alloy Ni₄₄MoTiAl 120 Constant elastic alloy 3J58 130 Elastic alloy 3J54 130 Elastic alloy 3J58 130 Elastic alloy 3J59 150 Amorphous soft magnetic alloy (FeNiCo)₇₈(SiB)₂₂ 150 Elastic alloy 3J53 155 Elastic alloy 3J61 160 Elastic alloy 3J62 165 Precision alloy 4J36 230 Precision alloy 4J32 220

Chemical components of the elastic alloy 3J53 in the Table comprise:

an element C with a content no more than 0.05%; an element S with a content no more than 0.020%; an element P with a content no more than 0.020%; an element Mn with a content no more than 0.80%; an element Si with a content no more than 0.80%; an element Ni with a content ranging from 41.5% to 43.0%; an element Cr with a content ranging from 5.2% to 5.8%; an element Ti with a content ranging from 2.3% to 2.7%; an element Al with a content ranging from 0.5% to 0.8%; and the balance of an element Fe.

Chemical components of the elastic alloy 3J58 comprise:

an element C with a content no more than 0.05%; an element S with a content no more than 0.020%; an element P with a content no more than 0.020%; an element Mn with a content no more than 0.80%; an element Si with a content no more than 0.80%; an element Ni with a content ranging from 43.0% to 43.6%; an element Cr with a content ranging from 5.2% to 5.6%; an element Ti with a content ranging from 2.3% to 2.7%; an element Al with a content ranging from 0.5% to 0.8%; and the balance of an element Fe. Chemical components of the precision alloy 4J32 comprise: an element C with a content no more than 0.05%; an element S with a content no more than 0.020%; an element P with a content no more than 0.020%; an element Mn with a content ranging from 0.20% to 0.60%; an element Si with a content no more than 0.20%; an element Ni with a content ranging from 31.5% to 33.0%; an element Co with a content ranging from 3.2% to 4.2%; an element Cu with a content ranging from 0.4% to 0.8%; and the balance of an element Fe. Chemical components of the precision alloy 4J36 comprise:

-   -   an element C with a content no more than 0.05%;         an element S with a content no more than 0.020%;         an element P with a content no more than 0.020%;         an element Mn with a content ranging from 0.20% to 0.60%;         an element Si with a content no more than 0.30%;         an element Ni with a content ranging from 35.0% to 37.0%; and         the balance is an element Fe.

The alloy materials above can be produced and provided by Shanghai Kaiye Metal Products Co., Ltd., or acquired through other public sales channels.

In addition, a content of iron in the permalloy is 35% to 70%, and a content of nickel in the permalloy is 30% to 65%.

The electromagnetic generating device comprises an electromagnetic coil, a signal generating unit and a signal receiving unit, the electromagnetic coil is connected to the signal generating unit and the signal receiving unit respectively, the signal generating unit is connected to a control module, the signal receiving unit is connected to a detection analysis module, and the connection is preferably the electric connection.

Preferably, a signal sent by the signal generating unit is a pulse number, a pulse width, or a pulse amplitude. The signal generating unit sends the signal to the electromagnetic coil, and the electromagnetic coil generates the electromagnetic signal after receiving the signal.

The present invention further provides a method for controlling a flame size of the gas cooking device, which comprises the following steps.

1) Provide the gas cooking device above.

2) Set a corresponding relationship between a temperature value of the cooking device and an electric parameter value of the electromagnetic generating device, the electric parameter is for example a parameter of a pulse signal, a voltage, a current or a resistance, wherein the pulse signal is a pulse number, a pulse width or a pulse amplitude, etc., because these electric parameters can form a specific corresponding relationship with the temperature value of the temperature control layer.

3) Detect and acquire a detection value of the electric parameter of the electromagnetic generating device, and then control the temperature value of the cooking device within an expected range by adjusting the gas flow through the control valve according to the detection value of the electric parameter or the temperature value corresponding to the detection value.

Preferably, the step 2) further comprises setting an expected value of the electric parameter or a temperature value corresponding to the expected value, and in the step 3), the detection value of the electric parameter of the electromagnetic generating device is acquired, and is compared with an expected set value; and when the detection value of the electric parameter of the electromagnetic generating device is greater than or less than the set value, or when the temperature value corresponding to the detection value of the electric parameter is greater than or less than the temperature value of the set value, the detection value of the electric parameter is controlled to be within the expected range by adjusting the gas flow through the control valve.

Preferably, in the step 3), the detection value of the electric parameter of the electromagnetic generating device is acquired through the detection analysis module of the control unit, and compared with the set value in the step 2), and an analysis result is fed back to the control module; and the control module adjusts the control valve according to the analysis result, so that the detection value in the electromagnetic generating device is equal to or close to the set value.

Further, the set value in the step 2) comprises a set lowest value and a set highest value for the electric parameter of the electromagnetic generating device, and in the step 3), when the detection value of the electric parameter of the electromagnetic generating device is greater than the set highest value or less than the set lowest value, the control valve is adjusted to decrease or increase the detection value of the electric parameter until the detection value of the electric parameter is between the set highest value and the set lowest value.

Compared with the prior art, the present invention has the following beneficial effects.

According to the present invention, the electromagnetic generating device is additionally arranged on the traditional gas cooking device, and then the temperature is controlled by adjusting a valve size of the control valve according to the change of the electric parameter of the electromagnetic generating device. Because the change of the electric parameter of the electromagnetic generating device is affected by the temperature of the temperature control layer, the electric parameter can form a corresponding relationship with the temperature of the temperature control layer, so that the temperature of the temperature control layer can be maintained in a certain range as long as the electric parameter is controlled to be within a certain range, thus controlling the temperature.

The present invention preferably uses the material of the temperature control layer with the Curie point temperature between 30° C. and 500° C., and can further control the temperature of the temperature control layer within the range of 30° C. to 500° C. For example, the temperature of the temperature control layer can be accurately controlled by setting a threshold value of the electric parameter of the electromagnetic generating device, such as controlling the temperature between 180° C. and 350° C. or other ranges, thus controlling the heating temperature of food. The control method changes the traditional manual control method and realizes the effect of automatic temperature control. In addition, since the control method is realized through the change of the electric parameter of the electromagnetic generating device, and the change of electric parameter can form the corresponding relationship with the temperature of the temperature control layer, the control unit can quickly detect the change of electric parameter and timely adjust the control valve, thus overcoming the hysteresis problem of temperature control.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a structural schematic diagram according to Embodiment 1 of the present invention.

FIG. 2 is a structural schematic diagram of an electromagnetic generating device.

FIG. 3 is a structural schematic diagram according to Embodiment 2 of the present invention;

FIG. 4 is a principle diagram of a method for controlling temperature according to the present invention.

FIG. 5 and FIG. 6 are curve graphs illustrating a relationship between a pulse number and a temperature.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

The present invention is further described below with reference to the detailed embodiments. The accompanying drawings are for illustrative purposes only, are merely schematic diagrams rather than physical diagrams, and cannot be construed as limiting the present invention. In order to better illustrate the embodiments of the present invention, some parts may be omitted, enlarged or shrunk in the accompanying drawings, and do not represent the actual product size. It is to be understood to those skilled in the art that certain known structures and descriptions thereof may be omitted.

The same or similar reference numerals in the accompanying drawings of the embodiments of the present invention correspond to the same or similar components. In the description of the present invention, it should be understood that if the orientation or positional relationship indicated by the terms “upper”, “lower”, “left”, “right” and the like is based on the orientation or positional relationship shown in the accompanying drawings, it is only for the convenience of describing the present invention and simplifying the description, and it is not to indicate or imply that the indicated device or element must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the positional relationship in the accompanying drawings are used for illustrative purposes only and should not be construed as limiting the patent. For a person of ordinary skill in the art, and the specific meaning of the above terms can be understood according to specific circumstances.

Embodiment 1

As shown in FIG. 1, the present invention relates to a gas cooking device, such as a gas stove, etc. The gas cooking device comprises a gas stove 2 and a cooking utensil 1 arranged above the gas stove 2. The cooking utensil is preferably a cookware 1. The gas stove 2 comprises a burner 21, a furnace frame 22, a panel 23, a gas feed tube 25, and a control valve 24. The panel 27 is provided with an installation hole, the burner 21 is arranged in the installation hole, the furnace frame 22 is arranged on the panel 23, and the furnace frame 22 and the burner 21 are arranged as concentric circles, i.e., the furnace frame 22 is arranged at a periphery of the burner 21 to support an object to be heated. The gas feed tube 25 is communicated with the burner 21 to provide a tube for gas supply, the gas feed tube 25 is provided with the control valve 24, and the control valve 24 can be an electromagnetic valve or other valves with a function of adjusting a gas flow. The gas cooking device further comprises an electromagnetic generating device 27 and a control unit 26 which are arranged below the cookware 1, the electromagnetic generating device 27 and the control valve 24 are both electrically connected to the control unit 26, the electromagnetic generating device 27, the control valve 24 and the control unit 26 are all connected to a power supply, the electromagnetic generating device 27 is preferably fixed above or below the burner 21, the electromagnetic generating device is mainly composed of an electromagnetic coil, a signal generating unit and a signal receiving unit, and the electromagnetic coil is electrically connected to the signal generating unit and the signal receiving unit respectively. The electromagnetic generating device is used to generate an electromagnetic field, a size and a number of turns of the electromagnetic coil can be freely set according to actual needs, the electromagnetic generating device is connected to the control unit 26, and the control unit 26 is preferably fixed below the panel 23.

As a preferred embodiment, two to six gas feed tubes 25 are preferably provided, and each of the gas feed tubes 25 is provide with a control valve 24, and a total gas flow is controlled by controlling different flows of the gas feed tubes 25 or closing a part of the gas feed tubes 25; or the gas feed tube 25 is composed of two to six sub-tubes, and each of the sub-tubes is provided with a control valve 24, and the total gas flow can also be controlled by controlling a flow of each of the sub-tubes.

As another preferred embodiment, the cookware 1 is provided with a temperature control layer 11 capable of inducing the electromagnetic signal generated by the electromagnetic generating device 27. The temperature control layer 11 can be made into a whole cookware or a part of the cookware, and is combined with a cookware body by riveting, welding, melting, printing or other methods. When the temperature control layer 11 is arranged at a bottom of the cookware 1, the temperature control layer 11 can either form the bottom of the cookware 1 separately or be compounded at the bottom of the cookware 1 to become a part of the bottom of the cookware 1. As for a compounding position, the temperature control layer 11 can be located on an upper surface of the bottom of the cookware 1 or on a lower surface of the bottom of the cookware 1. The bottom of the cookware, i.e. the bottom part of the cookware, can be of a single-layer design or a composite design, for example, the bottom of the cookware is formed by compounding one or more of an aluminum plate, a steel plate, a copper plate and an iron plate. When the bottom of the cookware 1 is of the composite design, the temperature control layer 11 can also be arranged between the upper surface and the lower surface of the bottom of the cookware 1. Certainly, for three-dimensional heating, the temperature control layer can also be arranged on the cookware body.

The temperature control layer 11 has a high magnetic permeability, the temperature control layer 11 is made of a ferromagnetic or ferrimagnetic material, such as a permalloy and a precision alloy, with the magnetic permeability suddenly dropping to zero or close to zero at a Curie point. The so-called permalloy is an iron-nickel alloy. The magnetic permeability of the temperature control layer 11 is preferably 2000 H/m to 200000 H/m, and a resistivity of the temperature control layer 11 is preferably 30μΩ·cm to 130 μΩ·cm.

In the present embodiment, the precision alloy material is preferably a precision alloy 4J36 (produced by Shanghai Kaiye Metal Products Co., Ltd.) or a precision alloy 4J32 (produced by Shanghai Kaiye Metal Products Co., Ltd.), and a thickness of the temperature control layer 11 is preferably 0.1 mm to 3 mm, and is 1.5 mm in the present embodiment.

The temperature control layer 11 has a sheet structure, is compounded at the bottom of the cookware 1, can also be made of a powdery or granular precision alloy material, and is attached to the bottom of the cookware 1.

For the present invention, it is obvious that any material of the temperature control layer that has the resistivity above or the ferromagnetism changing with temperature can be applied to the present invention. The permalloy material or the precision alloy material preferably used in the present embodiment is the precision alloy material with a Curie point temperature between 30° C. and 500° C., which is further preferably the precision alloy material with a Curie point temperature between 70° C. and 400° C. For types of the precision alloy materials, the following alloy materials are preferably used in the present embodiment.

Alloy type Alloy designation Curie point Ferromanganese alloy 4J59 70 Constant elastic alloy 3J53 110 Constant elastic alloy 3J53Y 110 Elastic alloy Ni₄₄MoTiAl 120 Constant elastic alloy 3J58 130 Elastic alloy 3J54 130 Elastic alloy 3J58 130 Elastic alloy 3J59 150 Amorphous soft magnetic alloy (FeNiCo)₇₈(SiB)₂₂ 150 Elastic alloy 3J53 155 Elastic alloy 3J61 160 Elastic alloy 3J62 165 Precision alloy 4J36 230 Precision alloy 4J32 220

The permalloy is also called iron-nickel alloy, wherein a content of iron is 35% to 70%, and is further preferably 63% to 67%, and a content of nickel is 30% to 65%, and is further preferably 37% to 58%. The iron-nickel alloy has a high magnetic permeability, and the magnetic permeability of the iron-nickel alloy can suddenly drop to close to a vacuum magnetic permeability at the Curie point.

The control unit 26 comprises a detection analysis module and a control module, and the detection analysis module is connected to the electromagnetic generating device. Specifically, as shown in FIG. 2, the detection analysis module is connected to the signal receiving unit of the electromagnetic generating device, the detection analysis module is used to detect the change of the electric parameter of the electromagnetic generating device in real time, and the change of the electric parameter is affected by a change of the temperature of the temperature control layer 11 and forms a corresponding linear relationship with the temperature of the temperature control layer 11. The electric parameter can be a parameter of a pulse signal, a voltage, a current or a resistance, wherein the pulse signal is preferably a pulse number, a pulse width or a pulse amplitude, etc. Taking the pulse number as an example, an input end of the control module is connected to the detection analysis module, and an output end of the control module is connected to the control valve. After the detection analysis module detects the pulse number in the electromagnetic generating device, whether the pulse number exceeds an initially set lowest or highest value is judged through comparison; when the pulse number exceeds the range, the control module will adjust the control valve, that is, a gas volume is controlled, and finally adjust a flame size of the gas cooking device, thus achieving the function of adjusting the temperature of the temperature control layer 11; and when the pulse number does not exceed the range, the current flame size will be maintained, thus ensuring that the temperature of the temperature control layer is maintained in a certain interval. In addition, the control module is also connected to a signal generating unit in the electromagnetic generating device.

The present invention further provides a method for controlling a flame size of a gas cooking device, which comprises the following steps.

1) Provide the gas cooking device above.

2) Set a corresponding relationship between a temperature value of the cooking device and an electric parameter value of the electromagnetic generating device in the control module, especially a corresponding relationship between the temperature value of the temperature control layer of the cooking device and the electromagnetic generating device, wherein a unique physical characteristic of the temperature control layer enables a specific corresponding relationship to be formed between the temperature of the temperature control layer and the electric parameter of the electromagnetic generating device, and the present invention uses the corresponding relationship to control the temperature. The electric parameter being for example a pulse signal, a voltage, a current or a resistance, wherein the pulse signal is preferably a pulse number, a pulse width or a pulse amplitude, etc., and the pulse number is taken as an example, as shown in FIGS. 5 and 6.

3) Detect and acquire a detection value of the electric parameter of the electromagnetic generating device, and then control the temperature value of the cooking device within an expected range by adjusting the gas flow through the control valve according to the detection value of the electric parameter or the temperature value corresponding to the detection value.

Because the change of the electric parameter of the electromagnetic generating device reflects the change of the temperature of the temperature control layer 11, there is a specific corresponding relationship between the electric parameter of the electromagnetic generating device and the temperature of the temperature control layer 11. Therefore, the corresponding temperature value can be determined by the electric parameter value of the electromagnetic generating device, and then the temperature of the temperature control layer can be accurately controlled by controlling the control valve.

Preferably, the step 2) further comprises setting an expected value of the electric parameter or a temperature value corresponding to the expected value, and in the step 3), the detection value of the electric parameter of the electromagnetic generating device is acquired, and is compared with an expected set value; and when the detection value of the electric parameter of the electromagnetic generating device is greater than or less than the set value, or when the temperature value corresponding to the detection value of the electric parameter is greater than or less than the temperature value of the set value, the detection value of the electric parameter is controlled to be within the expected range by adjusting the gas flow through the control valve.

The set value of the electric parameter can be a value or a threshold value composed of two values, for example, the lowest value and the highest value of the electrical parameter are set, and the lowest value and the highest value are respectively corresponding to the two initially set values of the temperature of the temperature control layer. When the set value is a threshold value, the detection value of the electric parameter of the electromagnetic generating device is compared with the set value, when the detection value exceeds the lowest value or the highest value, the control module of the control unit controls the gas feed volume by adjusting the control valve, thus adjusting the temperature of the temperature control layer, so that the detection value of the electric parameter is decreased or increased until the detection value of the electric parameter is between the set highest and lowest values. When the detection value of the electric parameter of the electromagnetic generating device is between the set highest and lowest values, the control valve can maintain the original gas feed volume.

Specifically, take a pulse parameter for example, as shown in FIG. 4, after the gas stove begins to work, a pulse generating unit in the electromagnetic generating device generates a signal and transmits the signal to the electromagnetic coil, the signal can be a signal that can be identified, such as a parameter of a pulse number, a pulse width, a pulse amplitude, a voltage, a current or a resistance. The signal is received by the electromagnetic coil of the electromagnetic generating device and converted into the electromagnetic signal. Meanwhile, the control valve is opened, the burner takes fire and heats the temperature control layer after being supplied with gas, the electromagnetic signal acts with the temperature control layer and is attenuated by the loss of the temperature control layer, and the electric parameter of the electromagnetic generating device is changed with the change of the temperature of the temperature control layer and forms the specific corresponding relationship, such as a linear relationship formed between the pulse number and the temperature of the temperature control layer, wherein the electric parameter is a parameter of a pulse number, a pulse width, a pulse amplitude, a voltage, a current or a resistance, etc. The signal receiving unit in the electromagnetic generating device receives the electrical parameter, the detection analysis module of the control unit detects whether the electric parameter exceeds the initially set value, and transmits an analysis result to the control module of the control unit, the control module adjusts the gas flow through the control valve according to the analysis result to maintain the temperature of the temperature control layer within a preset interval, that is, when the detected electric parameter is greater than or less than the set value, the control module will decrease or increase the detection value of the electric parameter by controlling a valve size of the control valve until the detection value of the electric parameter is equal to or close to the set value. The so-called “close to” here refers to an acceptable difference within a certain range, for example, a current value within 0 A to 0.5 A, a voltage value within 50 V, a resistance value within 5Ω, and pulse signals within three can be considered as being close to the set value.

Except for the electric parameter serving as an object for comparison, the electric parameter value can also be converted into the corresponding temperature value for comparison.

Embodiment 2

As shown in FIG. 3, the present embodiment improves the temperature control layer 11 on the basis the Embodiment 1. In the present embodiment, the temperature control layer 11 exists independently of the cookware instead of being arranged on the cookware 1. Specifically, a support plate is arranged above the furnace frame 22, and the support plate is placed on the furnace frame 22. As another preferred embodiment, the support plate can also be integrated with or fixedly connected to the furnace frame 22, the temperature control layer not only is made into a sheet, but also can be made of a powdery or granular precision alloy material or iron-nickel alloy material, and is attached to the support plate. Certainly, in the Embodiment 1, the temperature control layer can also be made of the powdery or granular precision alloy material or iron-nickel alloy material, and is attached to a bottom of the cookware.

In addition, the temperature control layer can also be arranged on a side of the electromagnetic generating device, and as long as the temperature control layer can induce the electromagnetic signal generated by the electromagnetic generating device, the temperature can be controlled.

Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and do not limit the implementations of the present invention. For those of ordinary skills in the art, other different forms of changes or variations can be made on the basis of the description above. All embodiments need not and cannot be exhaustive here. Any modifications, equivalents, and improvements made within the spirit and principle of the present invention shall all be included within the scope of protection claimed in the present invention. 

1. A gas cooking device, comprising a burner, a gas feed tube and a control valve used to control a gas flow, wherein the gas cooking device is further provided with an electromagnetic generating device capable of generating an electromagnetic signal and a control unit capable of controlling an opening size of the control valve, and the control valve and the electromagnetic generating device are connected to the control unit respectively.
 2. The gas cooking device according to claim 1, wherein a temperature control layer capable of inducing the electromagnetic signal generated by the electromagnetic generating device is arranged above or on a side of the electromagnetic generating device.
 3. The gas cooking device according to claim 2, wherein the temperature control layer has a magnetic permeability of 2,000 to 200,000 H/m and a resistivity of 30 to 130 μΩ·cm.
 4. The gas cooking device according to claim 1, wherein two to six gas feed tubes are provided, and each of the gas feed tubes is provide with a control valve; or, the gas feed tube is composed of two to six sub-tubes, and each of the sub-tubes is provided with a control valve.
 5. The gas cooking device according to claim 1, wherein the control unit comprises a detection analysis module and a control module, wherein the detection analysis module is connected to the electromagnetic generating device and used to detect a change of an electric parameter of the electromagnetic generating device, compare a detection value with an initial set value, and feed back an analysis result to the control module; and an input end of the control module is connected to the detection analysis module, an output end of the control module is connected to the control valve, and the control module adjusts the gas flow through the control valve according to the analysis result to keep a temperature of a temperature control layer within a preset interval.
 6. The gas cooking device according to claim 1, wherein a cooking utensil is arranged above the burner, and a temperature control layer capable of inducing the electromagnetic signal generated by the electromagnetic generating device is arranged on the cooking utensil.
 7. The gas cooking device according to claim 6, wherein the temperature control layer forms at least a part of the cooking utensil.
 8. The gas cooking device according to claim 2, wherein the temperature control layer is sheet, or, the temperature control layer is made of a powdery or granular permalloy material or precision alloy material.
 9. The gas cooking device according to claim 2, wherein a support plate is arranged above the burner.
 10. The gas cooking device according to claim 9, wherein the temperature control layer forms at least a part of the support plate.
 11. The gas cooking device according to claim 2, wherein the temperature control layer is made of a permalloy or precision alloy material.
 12. The gas cooking device according to claim 11, wherein a Curie point temperature of the permalloy or precision alloy material is between 30° C. and 500° C.
 13. The gas cooking device according to claim 12, wherein the Curie point temperature of the permalloy or precision alloy material is between 70° C. and 400° C.
 14. The gas cooking device according to claim 11, wherein the precision alloy material is a precision alloy 4J36, a precision alloy 4J32, a ferromanganese alloy 4J59, a constant elastic alloy 3J53, a constant elastic alloy 3J53Y, a constant elastic alloy 3J58, an elastic alloy 3J54, an elastic alloy 3J58, an elastic alloy 3J59, an elastic alloy 3J53, an elastic alloy 3J61, an elastic alloy 3J62, an elastic alloy Ni₄₄MoTiAl, a precision alloy 4J36, a precision alloy 4J32 or an amorphous soft
 15. The gas cooking device according to claim 11, wherein a content of iron in the permalloy is 35% to 70%, and a content of nickel in the permalloy is 30% to 65%.
 16. The gas cooking device according to claim 1, wherein the electromagnetic generating device comprises an electromagnetic coil, a signal generating unit and a signal receiving unit, the electromagnetic coil is connected to the signal generating unit and the signal receiving unit respectively, the signal generating unit is connected to a control module, and the signal receiving unit is connected to a detection analysis module.
 17. The gas cooking device according to claim 16, wherein a signal sent by the signal generating unit is a parameter of a pulse number, a pulse width, a pulse amplitude, a voltage, a current or a resistance.
 18. A method for controlling a flame size of the gas cooking device according to claim 2, comprising the following steps of: 1) providing the gas cooking device according to claim 1; 2) setting a corresponding relationship between a temperature value of the cooking device and an electric parameter value of the electromagnetic generating device; and 3) detecting and acquiring a detection value of the electric parameter of the electromagnetic generating device, and then controlling the temperature value of the cooking device within an expected range by adjusting the gas flow through the control valve according to the detection value of the electric parameter or the temperature value corresponding to the detection value.
 19. The method for controlling a flame size of the gas cooking device according to claim 18, wherein the electric parameter in the step 1) is a parameter of a pulse signal, a voltage, a current or a resistance.
 20. The method for controlling a flame size of the gas cooking device according to claim 18, wherein the step 2) further comprises setting an expected value of the electric parameter or a temperature value corresponding to the expected value, and in the step 3), the detection value of the electric parameter of the electromagnetic generating device is acquired, and is compared with an expected set value; and when the detection value of the electric parameter of the electromagnetic generating device is greater than or less than the set value, or when the temperature value corresponding to the detection value of the electric parameter is greater than or less than the temperature value of the set value, the detection value of the electric parameter is controlled to be within the expected range by adjusting the gas flow through the control valve.
 21. The method for controlling a flame size of the gas cooking device according to claim 20, wherein in the step 3), the detection value of the electric parameter of the electromagnetic generating device is acquired through the detection analysis module of the control unit, and compared with the set value in the step 2), and an analysis result is fed back to the control module; and the control module adjusts the control valve according to the analysis result, so that the detection value in the electromagnetic generating device is equal to or close to the set value.
 22. The method for controlling a flame size of the gas cooking device according to claim 21, wherein the set value in the step 2) comprises a set lowest value and a set highest value for the electric parameter of the electromagnetic generating device, and in the step 3), when the detection value of the electric parameter of the electromagnetic generating device is greater than the set highest value or less than the set lowest value, the control valve is adjusted to decrease or increase the detection value of the electric parameter until the detection value of the electric parameter is between the set highest value and the set lowest value. 